Constant input port impedance for CATV amplifier with...

Details Constant input port impedance for CATV amplifier with... Constant input port impedance for CATV amplifier with...

2011-07-05

2011-07-05

Lee, John (Department: 2618)

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

C455S572000, C455S127100, C455S083000

Reexamination Certificate

active

07974586

ABSTRACT:
A passive directional coupler is receptive of VoIP, Internet, and video/data signals, and is used in a CATV amplifier device to couple the video/data signals from a cable drop input port to the input terminal of an amplifier, and to passively bypass the VoIP and Internet signals to a modem port, for insuring continuous connection of the VoIP and Internet signals to the a modem of a user connected to the modem port, regardless of the loss of power to the amplifier or the failure of the amplifier, in one embodiment of the invention. In another embodiment, a switching circuit is responsive to the loss of power to the amplifier, for electrically connecting a 75 ohm resistor between a source of reference potential, and the common connection between the directional coupler and the amplifier, for maintaining a 75 ohm impedance at the directional coupler output to the common connection. In a preferred embodiment, the switching circuit also opens the common connection between the directional coupler and amplifier, upon the loss of power to the amplifier.

REFERENCES:
patent: 2005/0026571 (2005-02-01), Yang et al.
patent: 2005/0068223 (2005-03-01), Vavik
patent: 2006/0015921 (2006-01-01), Vaughan
patent: 2006/0205442 (2006-09-01), Phillips et al.
Anstine, Gerry; Advanced Services Drop Design; Dec. 12, 2004; 25 pages.

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